Ivy Taylor was selected by the San Antonio City Council as Castro's successor.

[1][2] City Councilman Ron Nirenberg became the first challenger to Taylor, announcing his candidacy on December 10, 2016.

[3] The chairman of the Bexar County Democratic Party, Manuel Medina, announced his candidacy on January 7, 2017.

None of the leading candidates received more than 50% of the vote and as a result, a runoff election was scheduled for Saturday, June 10, 2017 between the top two vote-getters.

This was also the first election in twenty years that the incumbent mayor of San Antonio sought re-election and lost, when Bill Thornton sought re-election in 1997 but failed to qualify for the runoff (Thornton was ultimately succeeded by Howard Peak).